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Backbone thioamide directed macrocyclisation: lactam stapling of peptides.

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Researchers developed a new method for peptide lactam stapling using a thioamide and silver, avoiding coupling agents. This technique efficiently creates various lactam-bridged peptides, including i,i+2, i,i+3, and i,i+4 spaced structures.

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Area of Science:

  • Medicinal Chemistry
  • Organic Synthesis
  • Peptide Chemistry

Background:

  • Peptide stapling is crucial for stabilizing peptide secondary structures.
  • Existing methods often rely on expensive or hazardous coupling agents.
  • Aspartate (Asp) and Lysine (Lys) residues are common in peptides but challenging for stapling.

Purpose of the Study:

  • To develop a novel, coupling agent-free method for lactam stapling of peptides containing Asp and Lys residues.
  • To enable the synthesis of peptides with various lactam bridge spacings (i,i+2 to i,i+4).

Main Methods:

  • Incorporation of a backbone thioamide adjacent to the Asp residue.
  • Silver(I)-promoted activation of the thioamide to form a cyclic isoimide intermediate.
  • Intramolecular trapping of the isoimide by the Lys amine to form the macrolactam.

Main Results:

  • A novel lactam stapling strategy was successfully developed.
  • The method proceeds without the need for external coupling agents.
  • Efficient formation of lactam-bridged peptides with i,i+2, i,i+3, and i,i+4 spacing was achieved.

Conclusions:

  • The developed thioamide-based method offers a new, efficient route for lactam stapling.
  • This approach simplifies peptide synthesis by eliminating coupling agents.
  • The versatility in bridge spacing makes it applicable to diverse peptide designs.